Grub Problems on Intel Mac Mini

[kmand]

I had been booting Ubuntu on a Mac Mini off of the internal disk (hd0,2) with
refit and legacy grub. This worked for quite a while and then it broke after
some Linux. Mac and hardware changes.

Now I get "GRUB Hard Disk Error", when refit tries to boot off the
partition. Apparently that means that grub is having trouble with the disk
geometry it tries to get from the bios when it goes to stage 1.5/2.

I know that the Bios emulation is still there, and Refit thinks the GPT and
MBR are in sync.

I can boot off a grub cd, which then boots from (hd0,2), but I would like to
avoid this step.

Another issue is that even with the grub cd there is a limitation. From the 
interactive mode it only sees the internal disk. I have a usb external
enclosure which grub does not see. Yet if I boot the same cd on a notebook,
grub does see the same external usb disk. Of course on either the mac mini
or the notebook, Linux can use the external disk once its up.

Any ideas

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